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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b26146bbf98ac1d0fe2d0591c3c17550e3e2ac799d74529783a24f3beb67185b' 
  AND token = 'laucXvhy469Qe/g//wvFbbUT8d04Ufs6XHC5PI+fGAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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