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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d9403691dc9793d2e6d2ffc9ad91893e5474b725b453b2820d5713430ab559d' 
  AND token = 'GaA6L4yYjiytFTuFPD7us6T0WccaU2eLtbiC9mMvjbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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