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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c31d4cd1ebe08eb8c4b2eb92b07df022667dca734c83aff5d11470a782078b7' 
  AND token = '2oI9+Z5DF+MmhXKwl8Z+fPPyT2b4Y96/RdRb+Yf1LY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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