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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d8ee3ac0a4c2f3d7dc80552fc2b1908f05cd823ba0774a28983c2ec841295cd' 
  AND token = 'TtQg01Y3OcLc0gPNRSwB1cNouDIL0fpk2G+aNc1WMP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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