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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1938a5885e1421b3a22443eb9da694939d639f59708ef391080984895ead800' 
  AND token = 'RCrqsp0yMulxRtO5uV1smNE0L7p0J8Pl4Bb+3qAJaow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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