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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0102b3b94a02d21556be396f4c90c0b8c6407b30a8f0e3885bc82c73ac67860' 
  AND token = 'ik2fZq9fzK3rRZn9Rbv+8I/o4+CNMQot0XDswD2W1dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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