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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc5c3aff5f7df10cd5f17b7c059d2d5c501aabfaccc4f37644c5d334c2502399' 
  AND token = 'LbI2bIcRTyvIIY5dSYKL51vjAfTH3YZHFd+rOihtmJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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