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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ef98a22d6abc9812a6e865bd45b0e816a7f56fdf8fadd82b4e350fff20d0196' 
  AND token = 'M3SnMfMvkRdZpEnZXfEuDvSfU3T4SAuLSSHd0V6QV2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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