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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70eb175f170e7458caa27550a2413089f257ee076e0ea00c307a65f818cbbe56' 
  AND token = '/y+0dROHmBq0wGTGXAxniMSZ56qR4bK+7d+UN3bpSBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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