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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f942be6830c9e1355ad31a53232b047140b01f2a6af03a51c374ad83147cc08' 
  AND token = '31cS1m3sRJwRCIkZcIPD/nUr6zpexG5Fx+S2Knxa5tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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