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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93e56e21cf1c9bc04bbb9561b9ec6deb333856c0498b525ee5c5057b527eccb6' 
  AND token = 'OJxigoikderIb+lJJtLI6FVrlFlva1LWhyv23mDSdMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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