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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffd8ea287ff19c798aa0c2c082d43ea8a7318992a2dade9ed7eac1fb8daaef21' 
  AND token = 'fi9vdQLl3uL6K8Dy/qj7kKWIbaOEdhDsTjlcqL8Ly/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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