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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7d6471aac0ec267d6555c2949720a47cdbeb607b5f6af7fe79e2708f7c911ba' 
  AND token = '6Ky78Ma03OEbyAOPLXxBlcGt+nsJu5AbxsEo55/JJoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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