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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19cab9937bed8a3e74329e908c6c3791b65b5547d177613780615a858034d994' 
  AND token = 'LLq2IMdsBXeDgDLVe3Wi1EfHoC9WBU+66Oo3+xouN78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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