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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c170acef8c42f9e54ee3dcb1b4a0e1f4419237fed82ec6f8ebce4f3c3a52408' 
  AND token = 'm+B0SNslMc1z51hHefjC4d7glQnVewzhZ6fbM0Mdz8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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