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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86b7241902d8a5efad69b2ec1f46663be136727118a33fa6ebe85d010552efe9' 
  AND token = 't1g8TPk70eK3vBkeMa/g1471P7DtjdK5XkqdR+qWQEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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