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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b29c9ce242a9e73c17cf0561cf7d6ea254b18fc2e540ac0a411d00970494cf7' 
  AND token = 'cmZbESimmiAnbhXrQvTxHV2VcX5+G0gwGmQtb0gn58I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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