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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e92fa342523cd46bb60e4279a4ec66c2c1966c7575c99e80c3bd1173ae83dab8' 
  AND token = '7gr82NGJY8Mj/DFN6yj1UNbVjUrqcO7E885Za1cqb1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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