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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '755a737530f01258c956d8c9ae1586c25e9851eec86cdc63faacd05e171755bf' 
  AND token = 'C8zzTcyJK+do8/iW832g1gwGxhV3wSrz5V3nL/YGlbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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