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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7543e75b42c7a53e242e65a1e4ed5fcb02e062e1760fcc0b44f1847f7874b95d' 
  AND token = 'hVyC2ptCpvCfwKlucdYIF3f9YrX+lx2yu68437M7EqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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