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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20a8ae94e6a9ea0e9c643c28d1b6144048a6d87dacb6fb1ea8fa87be48b7d1d6' 
  AND token = '22XSgts/NgKQ0/KtYbFAibEB60zhfEHSv0fTWMGYmRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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