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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cff4a560b9a28bed9f60b6bccbe45c2e363b3b616ee8114e46199370230a18e' 
  AND token = '9FyASnv7Eq9bVBTBiU+AAwfLnN/zioCxLBN44IVCdFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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