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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38215e93b616deccfee4d1456598f3fb5c5db9f7746b6aaddfce422c6f15472c' 
  AND token = '8aLELmidc5Em4TWYy9s0TPhMGnF14RdTjVqHe4H7VpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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