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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1223d50a04c64daf95cd4b29d82356c27d047baf3058b8c01fd2f4597be89f1d' 
  AND token = 'BeFzhaK0Hy79lHBnBe12fcxSVvrkDleN+KRFobLmI9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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