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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba4d3b06d82922ca61ab139dba664ce8722f82dc65778a05f25e6acc7d4cfdde' 
  AND token = 'jYyiPd972g+I6ycnAtkNnXydLg4RZ9RKoDaKJ6gGR08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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