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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bbac97ebed34afa336f26fcc8799a533eba412b222b2bb9c27d31bf0a6096c1' 
  AND token = 'qnoBvM0R2Z1prGTwb0X4ejZcwgLTrsu3dHoxlNojoUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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