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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87da75b927de228ba8e9ecde36626689385bd8d3c49653a435fea8bdce287947' 
  AND token = 'wtTQ59yYKKZjxhIi4LFJ54aHwcsv9y4IuvIwozEdjO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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