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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8bb1869acf6a0125b80bd89770b79ab36b43284468723585cd191efab9b13e57' 
  AND token = 'ufreumpX+j2QS/ezTN+uN95zCyc1asoZ2tmbRE0uPlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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