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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adc6260bab6bd909cbcbcfce2d6ba410f925b8546a81c33bc168d57a5971537b' 
  AND token = 'qJwaSghe/5jx9gdlWaQnH1SyXk+xnmdFTRcUNRTvB34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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