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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57fb524d6b39c2f9e4e222b9fb8764eee08fe47891c49d538c9f2c6fe70d4dd6' 
  AND token = '28AIXyMiU/lweM3rukb3/J+RIT742XcgRpw9IdscDyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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