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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df2ac85fab7807dd7c30d7f3a0b0cf050d49c9e58d133167d25c9b6b84a26ae1' 
  AND token = 'E3dKgSpc7+nRqlASEp3uXjzd0OC8g9B2N4QEa7Kr+3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}