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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '121c600c022d3d2c3468dfd92f9e1a7ff7728e3c1802f3df3c4d2672df94480e' 
  AND token = '3mHO1svJcMULfZnaEvnIdzVDi1Noq4jyoz3ZSBMumPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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