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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4b4dbb784e4af12d5641dba19eab882fa1973ac72d1b23310e44d38944c2e12' 
  AND token = '/SpYfIDfpuM/FdiLePRI2NctS4mCJ84APJqO7LerwsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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