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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd345b37540330e341e789410bfc7c61d27960ae876cb894adaf1d905bb2c5954' 
  AND token = 'dXxcgBlxTBSlmTYCQaRqqM3Y1cdFR2B31ssS9GCeYJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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