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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea66ed845e53b65b20828c2c799528ff5cb87b4824d8dc026acf56672c866517' 
  AND token = '/4718sPS2SbpKNszQLik1Ckojzp5eAL4jagQgOBeRM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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