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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91552669e5a53867ca69d6735085a13e72503d495faff743944cf93c4ff4df6c' 
  AND token = 'm9W4E+PfAT3rJAs0TGeXYFZdQgJ7SNbqXi+iPgoymtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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