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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8273ba01cebe3e5631c7703502ba418401a99800f33b1cdafb7e0724d66e0f88' 
  AND token = 't7kBoKbAre+PJwB3nV/fvMHKhneDTfTKkMy4LfZay9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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