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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af1e9558d5ccba56bad7364615507678614cc46165969a8541b35194e71f9afd' 
  AND token = 'zHBA3aH9RzYqQo9AtxQYfz5FVanVenHv6UgNAdGxlUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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