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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bb1a0b0dadec41b6367e402ab2ec7563426509ba0f4b49e81d933d8a0947a41' 
  AND token = 'w8W/fgEDDelF88wjUQxZa68g/orILeHEd6jXVcnb/MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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