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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10c9a26791a41bc941c6b513eb9352c58bf161673cf4a025cace39ef38ed8b15' 
  AND token = 'r5SP6pj7M+FN/N8jGEN+zpSn+qm8325NZgI1ZQc9myo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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