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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5caf9643ee71dfe8d2ba7b593e6672189e119d2992bd43b4fd3031146569a0b4' 
  AND token = '1GlTc5YARo1gYYfW1avU50NQ9FY3b0IcWU2QR1dKuTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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