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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '879afd362a2390299bc81d8c6c943f00721833095564b8ecfa9aa0e71fd62271' 
  AND token = '90NtdGDhMyt+bmKN17eCz2bZFsV1UHv78BiOMueSktc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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