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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba14c40ff0a90c51a9d4604687d6a5db93cdcf7bd90740b05b54d2f8f6895674' 
  AND token = '3Q0ueSXL4S4J2WulAMalu3FM2oZfKQyTaENJk5ocEzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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