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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5322db68da0a55d031d2f45644c034a18ecf18e3f635da58489a502c4327a8cf' 
  AND token = 'EmAKsnvOJ34WYtHNZabZD7XCwfvqtQ2rkGeISuQXP68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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