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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fce3d9b8dd1b5e5e4c2fb7a535f212da1834f11be5c73bd72fd791b6d5aff84' 
  AND token = '+D2gSWveYGogR+CU2AfTsflTvwCpI4nz+sjNdUOkI1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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