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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eee4fc063db11755af5450e5bc1c3ea990eadc9cb622c510e4fdbbd7ca920f21' 
  AND token = '5+w1h06dBjNq1U4tPYiC0rfyS+nHc/N9MdL1FoiSG4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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