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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b2f1dc2e35d6a5da663159f2ff4cd05ea8af21dd0e62149d11ffb1a11afe922' 
  AND token = 'MNXmN5zdqNCF3LkoKoMwVv16Ex7tZ/FXHYVqP1pLA8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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